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vtkUnstructuredGridGeometryFilter now supports degenerated cells

Florian Maurin requested to merge florian360/vtk:UnstructuredGridGeometryFilterDegeneratedCells into master

Degenerated cells are cells for which one edge or face is collapsed. It means that a single cell contains duplicated ids.

In vtkUnstructuredGridGeometryFilter::InsertFace, the index of the smallest point cell id was used to positionned a cell relative to another one. But if the point is not unique, we will have multiple indices, and we can't use these indices for relative positioning. So instead of using the smallest point id, we use the smallest unique point id.

fix: #19096 (closed)

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